2003. Boerboom, Terrence J., Green, John C., and Miller, James D., Jr. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Castle Danger quadrangle, scale ...

2003. Boerboom, Terrence J., Green, John C., and Miller, James D., Jr. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Two Harbors quadrangle, scale 1:...

2003. A. Woods, J. Omernik, S. Brockman, T. Gerber, W. Hosteter, And S. Azevedo and Indiana Geological Survey. The following is excerpted from the metadata for OHIN_ECO: "The ecoregions shown here have been derived from Omernik (1987) and fr refinements of ...